Investigation on Early Cracking Behavior of CRTS I Double-block Ballastless Track on Bridge
Based on the basic theory of early performance development of concrete,Ansys was used to develop a 3D temperature field and stress field analysis model of the CRTS Ⅰ double-block ballastless track on bridge.The early crack-ing behavior of the double-block ballastless track was numerically simulated,considering the effects of the factors inclu-ding curing method,demolding age,demolding temperature and the diameter of the steel bar.The results show that the development of the principal tensile stress of concrete at different positions of the track bed presents a cyclic upward trend in general.Before and after demolding,the fluctuation degree of the concrete stress-time history curve is quite dif-ferent,with the principal tensile stress of the track bed concrete increasing significantly within 4 hours after demolding.An appropriate curing method can reduce the early cracking risk effectively.With the increase of the demolding age and the demolding temperature,the temperature fluctuation and the risk of cracking of the track bed both show a decreasing trend.Under the same reinforcement ratio,reducing the steel bar diameter can reduce the risk of early cracking of the CRTS Ⅰ double-block ballastless track on bridge.
CRTS Ⅰ double-block ballastless track on bridgeearly temperature fieldearly crackingnumerical simula-tion
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